Basic dyes as flocculating agents for approximate quantitative determination of colloids in sugar-house liquors
✍ Scribed by M.S. Badollet; H.S. Paine
- Book ID
- 104126617
- Publisher
- Elsevier Science
- Year
- 1926
- Tongue
- English
- Weight
- 140 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
✦ Synopsis
AN investigation
conducted in the Bureau of Chemistry showed that the Rupp test is not reliable for the detection of added chlorine in milk when the milk contains more than I part of copper in 4oo,ooo parts. As fresh milk contains very much less copper than I p'art per 4oo,ooo, it may be assumed that the Rupp procedure is admissible for testing a fresh milk for chlorine. In fact, in all the tests made on fresh milks, including bottled market milks, the Rupp test gave negative results.
Nevertheless, it is conceivable that under certain conditions bottled milk might take up enough copper to give a positive reaction with the Rupp test. It would seem, therefore, that in case a milk gives the Rupp test, the copper content of the milk should be established in order to avoid an erroneous conclusion as to the presence of added chlorine.